CN213164694U

CN213164694U - Compact handheld angle grinder with high transmission efficiency

Info

Publication number: CN213164694U
Application number: CN202021245306.0U
Authority: CN
Inventors: 刘霖
Original assignee: Zhejiang Deshuo Electric Appliance Co ltd
Current assignee: Zhejiang Deshuo Technology Co.,Ltd.
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-05-11
Anticipated expiration: 2030-06-30

Abstract

The utility model discloses a compact hand-held type angle mill that transmission efficiency is high belongs to the angle mill field, including casing, driving motor, planetary gear assembly and emery wheel axle, driving motor sets up in the casing, and the linkage end of emery wheel axle sets up in the casing and is connected with driving motor's motor shaft transmission through planetary gear assembly, the output of emery wheel axle stretches out the casing and is connected with the grinding wheel piece, emery wheel axle and driving motor's motor shaft setting is on same axis. The utility model discloses the reduction ratio is big, makes driving motor's transmission efficiency reach the biggest, compact structure, and the user is handheld comfortable.

Description

Compact handheld angle grinder with high transmission efficiency

Technical Field

The utility model relates to an angle mill field especially relates to compact hand-held type angle mill that transmission efficiency is high.

Background

An electric hand-held angle grinder is used as a common grinding tool, and mainly utilizes a sheet-type grinding wheel piece and other structures which rotate at a high speed to grind, cut, remove rust and polish metal, stone and the like. The electric hand-held angle grinder mainly comprises a shell, a driving motor arranged in the shell and a grinding wheel shaft which is connected with the driving motor and extends out of the shell, wherein one end of the grinding wheel shaft is arranged in the shell and is connected with a motor shaft of the driving motor through a reduction gear train, the other end of the grinding wheel shaft extends out of the shell and is connected with a grinding wheel, the driving motor drives the grinding wheel shaft to rotate through the reduction gear train, and the grinding wheel shaft drives the grinding wheel to rotate at a high speed so as to grind metal, stone and other materials. In the prior art, a motor shaft of a driving motor and a grinding wheel shaft are generally vertically or greatly distributed, the motor shaft of the driving motor and the grinding wheel shaft realize the purposes of transmission and steering through a bevel gear, a handle and a shell of the electric hand-held angle grinder are of an integrated structure, namely, the length direction of the handle is parallel to the length direction of the shell or distributed at a small angle, thereby improving the operation experience of operators, when the angle grinder with the structure is used, the working load of the bevel gear is improved, the transmission stability of the driving motor is influenced, the service life of the angle grinder is influenced after long-term use, meanwhile, the diameter of the shell is greatly influenced by the diameter of the driving motor and the bevel gear, when the diameter of the driving motor is large, so that the diameter of the shell is large, the difficulty increases when operating personnel controls the handle with casing integrated into one piece, influences operating personnel's operation experience.

In order to solve the problems, the prior art designs a grinding wheel shaft and a motor shaft which are distributed in parallel, for example, a handheld angle grinder with application publication number of CN108908027A, a driving motor is arranged in the shell longitudinally, the first end of the grinding wheel shaft is arranged in the shell and is connected with the output shaft of the driving motor through a reduction gear train, the second end of the grinding wheel shaft extends out of the shell and is connected with a grinding wheel, and the grinding wheel shaft is opposite to the driving motor and is arranged in parallel with the output shaft of the driving motor. However, the reduction gear system of the handheld angle grinder with the structure adopts non-coaxial transmission, the reduction ratio is small, the motor efficiency effect is small, the size of the handheld angle grinder is increased, the structure is not compact enough, and the operation comfort is not good.

Disclosure of Invention

The utility model aims to solve the technical problem that a compact hand-held type angle mill that transmission efficiency is high is provided.

The technical scheme of the utility model is that: compact hand-held type angle mill that transmission efficiency is high, its characterized in that includes casing, driving motor, planetary gear assembly and emery wheel axle, driving motor sets up in the casing, and the linkage end of emery wheel axle sets up in the casing and is connected through planetary gear assembly and driving motor's motor shaft transmission, the output of emery wheel axle stretches out the casing and is connected with the emery wheel piece, emery wheel axle and driving motor's motor shaft setting are on the same axis.

And a motor shaft of the driving motor and the grinding wheel shaft are driven by a primary planetary gear assembly.

The shell is provided with a self-locking assembly, the self-locking assembly can move along the radial direction of the axle center of the grinding wheel axle, the self-locking assembly is moved to enable the self-locking assembly to be in contact with the output shaft of the planet carrier connected to the planet wheel, and the self-locking assembly limits the rotation of the output shaft of the planet carrier.

The auto-lock subassembly includes self-locking pin and locking plate, be equipped with the movable hole and the spacing hole that are linked together on the locking plate, spacing hole site is in the movable hole top, and the output shaft of planet carrier is inserted in the movable hole and can rotate, is equipped with one at least restriction plane on the output shaft lateral wall of planet carrier, presses down the radial movement of self-locking pin drive locking plate along the emery wheel axle center and makes the inner wall in spacing hole and the output shaft rotation of restriction plane touching restriction planet carrier, be equipped with the output shaft separation of spacing hole of elasticity reset piece drive and planet carrier between locking plate bottom and the casing.

The locking plate bottom is equipped with location portion, the elasticity piece that resets is reset spring, and reset spring cover fixes a position on location portion, has the interval between location portion and the casing.

The shell comprises a head shell and a machine body shell, and the head shell is detachably connected to the front end of the machine body shell.

A handle is arranged below the machine body shell, and the handle and the machine body shell are integrally formed.

The handle and the body shell which are integrally formed are divided into a left half shell and a right half shell which are detachably connected.

The bottom of handle is equipped with the holding tank that is used for placing the battery.

And one end of a motor shaft of the driving motor, which is far away from the grinding wheel shaft, is connected with a fan blade.

Compared with the prior art, the utility model has the advantages that the linkage end of the grinding wheel shaft is arranged in the shell and is in transmission connection with the motor shaft of the driving motor through the planetary gear assembly, and the reduction ratio is large through the reduction transmission of the planetary gear assembly, so that the transmission efficiency of the driving motor reaches the maximum;

and the motor shaft setting of emery wheel axle and driving motor reduces the volume of angle mill on the same axis, makes the structure compacter, and is more comfortable when the user is handheld to use.

Drawings

The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the background art and explaining the preferred embodiments, and therefore should not be taken as limiting the scope of the present invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is a cross-sectional view of an angle grinder.

Fig. 2 is an exploded perspective view of the angle grinder.

FIG. 3 is a schematic view of the transmission relationship of the angle grinder.

FIG. 4 is a schematic view of an angle grinder without a grinding wheel attached.

FIG. 5 is a schematic view of the angle grinder with the grinding wheel attached.

FIG. 6 is a cross-sectional view of the self-locking assembly when unlocked.

FIG. 7 is a cross-sectional view of the self locking assembly locking the output shaft of the planet carrier.

Fig. 8 is an overall schematic view of the self-locking assembly.

In the figure: 1. a self-locking assembly; 2. a planetary gear assembly; 3. a sun gear; 4. a rear cover; 5. a first bearing; 6. a housing; 7. a drive motor; 8. a body shell; 9. a second bearing; 10. a motor shaft; 11. a fan blade; 12. mounting a shell; 13. a grip; 14. a switch; 15. a bearing seating groove; 16. a planet wheel; 17. an inner gear ring; 18. a planet carrier; 19. an output shaft; 20. a linkage end; 21. a grinding wheel cover; 22. an output end; 23. a grinding wheel spindle; 24. a grinding wheel sheet; 25. a support bearing; 26. a head shell; 27. a left and a right half shell; 28. pressing a plate; 29. a vent hole; 30. accommodating grooves; 31. a locking plate; 32. a self-locking cap; 33. a self-locking pin; 34. a limiting plane; 35. an elastic reset member; 36. a positioning part; 37. a movable hole; 38. and a limiting hole.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative only, and is not to be construed as limiting the scope of the invention.

It should be noted that: like reference numerals refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside" and "outside" are used for indicating the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

As shown in fig. 1-8, the compact hand-held angle grinder with high transmission efficiency comprises a housing 6, a driving motor 7, a planetary gear assembly 2 and a grinding wheel shaft 23, the housing 6 comprises a head shell 26 and a machine body housing 8, the head shell 26 is detachably connected to the front end of the machine body housing 8, preferably, the head shell 26 is detachably connected to the front end of the machine body housing 8 through conventional connection modes such as screws, a handle 13 is arranged below the machine body housing 8, the handle 13 and the machine body housing 8 are integrally formed, preferably, the integrally formed handle 13 and the machine body housing 8 are divided into left and right half shells 27 which can be detachably connected, and the mounting of components in the housing 6 is facilitated.

As shown in fig. 5, the bottom of the grip 13 is provided with a receiving groove 30 for placing a storage battery, and the switch 14 is arranged on the grip 13.

As shown in fig. 1 and 2, the driving motor 7 is disposed in the housing 6, and preferably, a mounting shell 12 is disposed in the housing 6, and the driving motor 7 is disposed in the mounting shell 12, so that external dust can be prevented from entering the driving motor 7 by disposing the driving motor 7 in the mounting shell 12.

As shown in fig. 1, the linkage end 20 of the grinding wheel shaft 23 is disposed in the housing 6 and is in transmission connection with the motor shaft 10 of the driving motor 7 through a planetary gear assembly 2, preferably, the motor shaft 10 and the grinding wheel shaft 23 of the driving motor 7 are in transmission connection with a primary planetary gear assembly, the primary planetary gear assembly includes a sun wheel 3, a planet carrier 18, an inner gear ring 17 and a set of planet wheels 16, a rear cover 4 is disposed on one side of the inner gear ring 17 close to the driving motor 7, the rear cover 4 covers an opening of the inner gear ring 17, the motor shaft 10 of the driving motor 7 passes through the rear cover 4 and is in transmission connection with the sun wheel 3 in the inner gear ring 17, a first bearing 5 is disposed between the motor shaft 10 of the driving motor 7 and the rear cover 4, the first bearing 5 is sleeved on the motor shaft 10 of the driving motor 7, preferably, a bearing seating groove 15 is disposed on the rear cover 4, the, when a motor shaft 10 of a driving motor 7 drives a sun wheel 3 to rotate, a first bearing 5 can effectively reduce the rotating friction force of the motor shaft 10, the sun wheel 3 rotates to drive a planet wheel 16 to rotate around an inner gear ring 17, a planet carrier 18 connected to the planet wheel 16 rotates synchronously with the planet wheel 16, a linkage end 20 of a grinding wheel shaft 23 is in transmission connection with an output shaft 19 of the planet carrier 18, the planet carrier 18 drives the grinding wheel shaft 23 to rotate synchronously, and an output end 22 of the grinding wheel shaft 23 extends out of a shell 6 and is connected with a grinding wheel 24. The planetary gear assembly 2 is used for reducing the speed, the reduction ratio is large, a plurality of groups of reduction gears are not needed for transmission, and the transmission efficiency of the motor is maximized.

As shown in figure 1, the grinding wheel shaft 23 and the motor shaft 10 of the driving motor 7 are arranged on the same axis, the grinding wheel shaft 23 is coaxial with the output shaft 19 of the planet carrier 18, and the motor shaft 10 of the driving motor 7 is coaxial with the rotation center of the sun gear 3, so that the size of the angle grinder is reduced, the structure is more compact, and a user feels more comfortable when holding the angle grinder.

The front end of the head shell 26 is detachably connected with a grinding wheel cover 21, and preferably, the grinding wheel cover 21 is provided with a hoop structure which is detachably connected with the head shell 26. The wheel guard 21 covers the wheel 24 to block chips during grinding and protect a user.

As shown in fig. 1 and 3, a support bearing 25 is disposed between the grinding wheel spindle 23 and the housing 6, the support bearing 25 is sleeved on the grinding wheel spindle 23, the support bearing 25 supports the grinding wheel spindle 23 in the housing 6, and the support bearing 25 can effectively reduce the rotation friction force of the grinding wheel spindle 23.

As shown in fig. 1-3, a fan blade 11 is connected to one end of a motor shaft 10 of the driving motor 7, which is far away from the grinding wheel shaft 23, the fan blade 11 faces the driving motor 7, when the motor shaft 10 of the driving motor 7 rotates, the motor shaft 10 drives the fan blade 11 to rotate, air blown out from the fan blade 11 dissipates heat of the driving motor 7, and the housing 6 on both sides of the fan blade 11 is provided with a vent hole 29 communicating the inside and the outside of the housing 6.

As shown in fig. 1-3, a second bearing 9 is disposed between one end of the motor shaft 10 of the driving motor 7, which is far away from the grinding wheel shaft 23, and the tail of the machine body housing 8, and the second bearing 9 is sleeved on the motor shaft 10 of the driving motor 7, so that when the motor shaft 10 of the driving motor 7 rotates, the second bearing 9 can effectively reduce the rotating friction force of the motor shaft 10.

As shown in fig. 1, 6, 7 and 8, a self-locking assembly 1 is arranged on a housing 6, the self-locking assembly 1 can move along the radial direction of the axis of a grinding wheel spindle 23, the self-locking assembly 1 is moved to enable the self-locking assembly 1 to touch an output shaft 19 of a planet carrier 18, the self-locking assembly 1 limits the rotation of the output shaft 19 of the planet carrier 18, preferably, the self-locking assembly 1 comprises a self-locking pin 33 and a locking plate 31, the self-locking pin 33 is limited on the housing 6 and can move along the radial direction of the axis of the grinding wheel spindle 23, a self-locking cap 32 is detachably connected to the upper end of the self-locking pin 33, the locking plate 31 is located below the self-locking pin 33, the locking plate 31 is in contact with the lower end of the self-locking pin 33 or the locking plate 31 and the self-locking pin 33 are integrally formed, a movable hole 37 and a limiting hole 38 which are communicated are arranged on the locking plate 31, the, the output shaft 19 of the planet carrier 18 can rotate in the movable hole 37, at least one limiting plane 34 is arranged on the outer side wall of the output shaft 19 of the planet carrier 18, preferably, two limiting planes 34 are arranged on the outer side wall of the output shaft 19 of the planet carrier 18, the two limiting planes 34 are parallel, the self-locking cap 32 is pressed to drive the self-locking pin 33 to move along the radial direction of the axis of the grinding wheel shaft 23, the self-locking pin 33 pushes the locking plate 31 to move along the radial direction of the axis of the grinding wheel shaft 23 so that the limiting hole 38 is inserted into the output shaft 19 of the planet carrier 18, and the inner walls of the two sides of the limiting hole 38 of the locking plate. The self-locking assembly 1 is used for locking the output shaft 19 of the planet carrier 18 to prevent the grinding wheel spindle 23 from rotating, so that the pressure plate 28 for locking the grinding wheel 24 is convenient to disassemble and replace the grinding wheel 24.

Fig. 8 shows, be equipped with the output shaft 19 separation of the spacing hole 38 of elasticity piece 35 drive and planet carrier 18 between locking plate 31 bottom and the casing 6, it is preferred, locking plate 31 bottom is equipped with location portion 36, elasticity piece 35 that resets is reset spring, and reset spring cover fixes a position on location portion 36, has the interval between location portion 36 and the casing 6, and is preferred, location portion 36 is the width from last two cylinders that reduce down, passes through the step transition between two cylinders, and reset spring cover supports on the step on the cylinder that the width is little and the upper end.

As shown in fig. 1, the locking plate 31 is sandwiched between the planet carrier 18 and the supporting bearing 25 sleeved on the grinding spindle 23, and the planet carrier 18 and the supporting bearing 25 sleeved on the grinding spindle 23 can prevent the locking plate 31 from swinging or moving along the axial direction of the grinding spindle 23, so as to avoid affecting the self-locking function of the locking plate 31.

Self-locking assembly 1 operating principle: as shown in fig. 6 and 7, when the grinding wheel 24 on the grinding wheel spindle 23 needs to be replaced, the pressing plate 28 for locking the grinding wheel 24 is rotated, the grinding wheel spindle 23 also rotates, which affects the detachment of the pressing plate 28, so the self-locking assembly 1 needs to be arranged to lock the grinding wheel spindle 23, the self-locking cap 32 is pressed downward to drive the self-locking pin 33 to move downward along the radial direction of the axis of the grinding wheel spindle 23, the self-locking pin 33 pushes the locking plate 31 to move downward so that the limiting hole 38 on the locking plate 31 is inserted into the output shaft 19 of the planet carrier 18, the inner walls of the two sides of the limiting hole 38 of the locking plate 31 contact with the two limiting planes 34 to limit the rotation of the output shaft 19 of the planet carrier 18, so that the grinding wheel spindle 23 cannot rotate, the pressing plate 28 is rotated upward from the grinding wheel spindle 23, the grinding wheel 24 is replaced, the grinding wheel 24 is locked by rotating the pressing plate 28, the self-locking cap 32 is released by, the movable hole 37 of the lock plate 31 moves to the output shaft 19 of the carrier 18, and at this time, the output shaft 19 of the carrier 18 can rotate.

It is right above the utility model provides a compact hand-held type angle mill that transmission efficiency is high has carried out detailed introduction, and it is right to have used specific individual example herein the utility model discloses a principle and implementation mode have been explained, and the explanation of above embodiment only is used for helping understanding the utility model discloses and core thought. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. Compact hand-held type angle mill that transmission efficiency is high, its characterized in that includes casing, driving motor, planetary gear assembly and emery wheel axle, driving motor sets up in the casing, and the linkage end of emery wheel axle sets up in the casing and is connected through planetary gear assembly and driving motor's motor shaft transmission, the output of emery wheel axle stretches out the casing and is connected with the emery wheel piece, emery wheel axle and driving motor's motor shaft setting are on the same axis.

2. The efficient drive compact hand-held angle grinder of claim 1, wherein the motor shaft and the grinding wheel shaft of the drive motor are driven through a one-stage planetary gear assembly.

3. The compact handheld high-transmission-efficiency angle grinder as claimed in claim 1, wherein the housing is provided with a self-locking assembly, the self-locking assembly can move along the radial direction of the axis of the grinding wheel spindle, the self-locking assembly is moved to make the self-locking assembly touch an output shaft of a planet carrier connected to the planet wheel, and the self-locking assembly limits the rotation of the output shaft of the planet carrier.

4. The compact hand-held angle grinder with high transmission efficiency according to claim 3, wherein the self-locking assembly comprises a self-locking pin and a locking plate, the locking plate is provided with a movable hole and a limiting hole which are communicated with each other, the limiting hole is located above the movable hole, the output shaft of the planet carrier is inserted into the movable hole and can rotate, the outer side wall of the output shaft of the planet carrier is provided with at least one limiting plane, the self-locking pin is pressed to drive the locking plate to move along the radial direction of the axis of the grinding wheel shaft so that the inner wall of the limiting hole and the limiting plane touch and limit the rotation of the output shaft of the planet carrier, and an elastic reset piece is arranged between the bottom end.

5. The compact hand-held angle grinder with high transmission efficiency according to claim 4, wherein the bottom end of the locking plate is provided with a positioning portion, the elastic reset piece is a reset spring, the reset spring is sleeved on the positioning portion for positioning, and a space is formed between the positioning portion and the housing.

6. The drive efficient, compact, hand-held angle grinder of claim 1, wherein the housing comprises a head housing and a body housing, the head housing being removably attached to a front end of the body housing.

7. The compact, hand-held, high drive efficiency angle grinder of claim 6, wherein a handle is provided below the body housing, the handle being integrally formed with the body housing.

8. The power efficient, compact, hand-held angle grinder of claim 7, wherein the integrally formed handle and body housing are divided into left and right removably connected half shells.

9. The compact, highly power transmitting, hand-held angle grinder of claim 7, wherein the bottom of said handle is provided with a receiving groove for a battery.

10. The compact hand-held high transmission efficiency angle grinder of claim 1, wherein the end of the motor shaft of the driving motor far from the grinding wheel shaft is connected with a fan blade.